Why do phospholipid from a biliary in water ?

Phospholipids have a hydrophilic(water-liking) ‘head’ and a hydrophobic ‘tail’ so they are amphipathic. They form a lipid bilayer because of their amphipathic properties. The tails get sandwiches between the hydrophilic heads that are able to interact with water.

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as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.